Looking for suggestions…
I’m building a multiroom unit, which I expect to contain three Upstream V4’s. I’m re-purposing a 1999 DVD player as the case and currently trying to decide how leverage the buttons on the front (play, pause etc). The idea is that I would be able to select the amp with one button (eject), then use play/pause/skip/source etc with the others, meaning I would only expect to control one amp at a time.
While I do have a Pi Zero I could use to receive the button presses then send an API call to each amp for control, I’m trying to use something that doesn’t require a working network, something that won’t need security patches, something that doesn’t depend on SD card corruption, doesn’t mind being turned off abruptly etc…
So was hoping to leverage a Raspberry Pico, which would be my first Pico project, done plenty of Arduino ones already.
I was hoping to leverage the ADC Key, on the three Amps, but the Pico doesn’t have an ADC output only input. I’m thinking that I could try and find/make a simple DAC that creates the appropriate output voltage, which I send to the correct amp which would need a selector or multiple DACs.
I’m pretty certain PWM wouldn’t work as it doesn’t change the voltage just the time between cycles. I have looked at the LAN8720 breakout board as an option, but not sure how reliable it would be for the above reasons.
Anyone got recommendations for a DAC (purchase or make), or a different approach?
…update. may have found an answer